Using the Hotkey Bar

For a quick access to items, potions, pets or skills, you can assign them to a slot on the Hotkey Bar.
There are two sets of Hotkey Bars. The first panel is located at the bottom of the game screen and is best used for quick access to frequently used skills. The second panel is located right next to the players list.

First hotkey bar

You can put skills in this bar. To remove skills you have previously placed on this bar, simply hold down shift and drag the skill out of the bar. For easy access to skills you can change the hotkeys settings to assign custom keys rather than using the defaults. For example, you can use a skill on the first slot by pressing a custom key you assigned in the hotkeys setting. To do this, open Keyboard Settings and select the Panels tab. Now you can change the keys used to activate the slots.

Second hotkey bar

The second hotkey bar on the side is not visible until you activate it. The second bar acts the same way as the first, you can put anything you want in it: pets, potions of mana, life or status boosts, teleport scrolls, food and experience for the pets, etc. The Hotkey Bar makes it much easier and more convenient to use items than opening the bag and looking for it there. By default, the slots are binded to the keys 1, 2, 3, etc. They can also be customizable in the configuration tab labeled "Appearance".
NPC - Non-Player Character, NPC. Friendly or neutral to the player character.